Braille Battery

Braille Battery - Advanced AGM Technology 21 lb B3121

  • On sale
  • Regular price $229.99

Batteries have always presented the same problems of weight, safety, and cost. In racing, aerospace, and advanced technology industries, weight and safety present the two biggest challenges. Braille Battery’s solution is developing lighter, more powerful batteries to suit the needs of these markets. Braille Battery’s Advanced AGM batteries have allowed for more power, safer design and less overall weight than the batteries they replace, as the performance leader in the 12 volt sealed AGM (lead-acid) marketplace.

Sealed Valve Regulated Design

Completely eliminates acid spills and corrosion on terminals. Environmentally safe and does not need filling or maintenance.

Green Friendly

A manufacturing process with the highest concern for the environment and quality. Recycled lead, plastic, and stainless steel ensure we’ll have a future to race towards.

Stainless Steel Terminals

Allow higher bolt torque and help keep your battery connected even in high vibration environments.

Dual Terminals

Allow battery to be mounted in a variety of positions, vertically or horizontally, and are also removable.

At under 22 pounds, the B3121 is our lightest do eveything battery yet. Using our Advanced AGM racing technology we have put a lot of power into a very small package. With 1380 pulse cranking amps this has enough power to start more than any other battery in its weight class. This is the perfect model for those who want to shave half the weight of a stanard Group 34 battery and still have enough power to crank over a V8 engine. Used in everything from large Harley Davidsons to Corvettes & Vipers. (Note: while high in cranking amps, make sure battery has enough capacity for the vehicle intended to be used in)

Direct replacement for:

YIX30L, YB30L-B, ETX30L, HD 66010-97


Common Upgrade for:

PC925 (same size, 5 pounds lighter, 50% more cranking power)

Lightweight AGM Features

Highest Cranking Power Lead Battery Available. All Season Reliability. Stainless Steel Terminals. Environmentally Sourced Recycled Materials.

Physical Specifications

BCI Group All Sizes
Weight 21 lbs / 9.5 kg
Length 6.6" / 168mm
Width 5.2" / 132mm
Height 6.8" / 173mm
Polarity Right Side Positive



Voltage 12
 Full Charge Voltage 13.2
Pulse Cranking Amps (PCA) 1380
Amp Hour (AH) 31
Reserve Capacity (Rc) 1 h 15 mins.
Life Cycle @ 10% DOD 3100